From: Losmandy_users@... [mailto:Losmandy_users@...] Sent: Friday, December 8, 2017 12:28 PM To: Losmandy_users@... Subject: RE: [Losmandy_users] Re: Just purchased GM811GHD
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At 0.5 A, a 22 Ah battery would be good for 22 hours on the basis that these types of batteries should not be discharged to more than 50% pf their capacity.
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22 Ah*50%/0.5A? = 22 hours
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I have had good luck with Power-Sonic SLAs (I have 3).? This is a link to their 12V series.
Car starter batteries are more designed around offering a maximum amperage to kick over the motor.?
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for astro that's not important -? instead we want greater battery capacity, hence amp-hours
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if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long
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me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more.